package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.apache.ibatis.annotations.Mapper;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;


/**
 * 自定义切面,处理公共字段填充
 */
@Aspect
@Component
@Slf4j
public class AutoFillAspect {

    /**
     * 切入点
     */
    @Pointcut("execution(* com.sky.mapper.*.*(..))&&@annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut() throws Throwable {}
    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint) throws Throwable {
        log.info("元神启动");
    //获取当前被拦截方法上的数据库操作类型
    MethodSignature methodSignature = (MethodSignature) joinPoint.getSignature();//方法签名对象
    AutoFill autoFill=methodSignature.getMethod().getAnnotation(AutoFill.class);//获得方法上的注解对象
        OperationType operationType=autoFill.value();  //获得数据操作类型

    //获取被拦截方法的参数--实体对象
    Object[] args = joinPoint.getArgs();
    if(args==null||args.length==0){
        return;
    }
    Object entity=args[0];

    //准备赋值的数据
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();

        //根据当前不同的操作类型，为对应的属性通过反射赋值
        if(operationType==OperationType.INSERT){
           try {
               Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
               Method setCreateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
               Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
               Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);

               //通过反射为对象属性赋值
               setCreateTime.invoke(entity, now);
               setCreateUser.invoke(entity, currentId);
               setUpdateTime.invoke(entity, now);
               setUpdateUser.invoke(entity, currentId);


           }catch (Exception e){
               e.printStackTrace();
           }



        } else if (operationType==OperationType.UPDATE) {


            try {
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);

                //通过反射为对象属性赋值

                setUpdateTime.invoke(entity, now);
                setUpdateUser.invoke(entity, currentId);


            }catch (Exception e){
                e.printStackTrace();
            }



        }


    }
}
